DifferentialAs far as I know, when you walk, you convert your muscular energy to kinetic energy (to move from one point to another). If you want to convert it to...

Just my humble opinions: ON the piezo note, good luck finding piezos that can withstand the temp of the exhaust. On the telephone speaker note, if you harness the energy...

First off, I guess it was already mentioned in the Quick start guide that you're not supposed to use SMS language when typing in here. That said, on to the...